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onsemi FAN49100AUC330X
- Part No.:
- FAN49100AUC330X
- Manufacturer:
- onsemi
- Package:
- 20-UFBGA, WLCSP
- Datasheet:
-
FAN49100AUC330X.pdf
- Description:
- IC REG BUCK BST 3.3V 2A 20WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:5,683
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Product details
Overview
FAN49100AUC330X from onsemi is a synchronous buck-boost DC-DC regulator delivering up to 2.5 A at 3.3 V output with 2.5 V–5.5 V input range, 1.8 MHz fixed-frequency PWM operation, and seamless mode transition between buck/boost/buck-boost topologies. It serves as the primary power rail for Li-ion–powered portable electronics requiring stable 3.3 V supply under variable battery voltage.
For engineers reviewing the FAN49100AUC330X datasheet, pinout, applications, or equivalent options, key selection criteria include its 20-bump WLCSP package, 24 µA PFM quiescent current, ±5% total output accuracy under load transients, and integrated protections (UVLO, OTP, SCP, OCP).
Technical Context
The FAN49100AUC330X implements a full-bridge synchronous architecture with four MOSFETs (Q1–Q4) enabling true buck, boost, and buck-boost operation depending on PVIN relative to VOUT. Mode transitions are fully automatic and seamless-no output disturbance occurs when crossing the VOUT threshold.
In PFM mode, it maintains high efficiency at light loads with 24 µA typical quiescent current and 75 mV intentional output overvoltage headroom; in forced or auto PWM mode, it operates at 1.6–2.0 MHz (typ. 1.8 MHz), supporting compact 1.0 µH inductors and low-ESR ceramic capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±0.033 V (±1%) DC accuracy; ±5% total accuracy including load transient effects |
| Input Voltage Range | 2.5 V to 5.5 V - supports full Li-ion battery discharge curve (3.0–4.2 V nominal + tolerance) |
| Max Output Current | 2.5 A continuous - limited by thermal design and PCB copper area; peak current limit is 4.6–5.9 A |
| Switching Frequency | 1.8 MHz nominal in PWM mode - enables use of 1.0 µH inductor and reduces external component footprint |
| Quiescent Current | 24 µA in PFM mode - extends battery life in standby; 0.5 µA shutdown current isolates VOUT from PVIN |
| Efficiency | 96% at 3.8 VIN/3.3 VOUT/600 mA - exceeds 90% across 75 mA–1 A in PFM/PWM boundary region |
| Package | 20-ball WLCSP, 1.615 mm × 2.015 mm × 0.586 mm - ultra-compact footprint (11.61 mm² total layout area) |
Pinout & Package
Package: 20-ball Wafer-Level Chip-Scale Package (WLCSP), 0.4 mm pitch, case 567QK, dimensions 2.015 mm × 1.615 mm × 0.586 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A3, A4 | PVIN | Main power input - connects directly to input capacitor; handles full input current path |
| A1 | AVIN | Analog input reference - tied to CIN and PVIN; supplies bias for control circuitry |
| A2 | EN | Enable control - HIGH enables regulation; LOW forces shutdown with 0.5 µA current draw |
| B3, B4 | SW1 | Switch node 1 - connects to one end of power inductor; carries high di/dt switching current |
| E1 | AGND | Analog ground - reference for internal control logic; must be shorted to PGND at COUT ground pad |
| B1, C1–C4, D1 | PGND | Power ground - return path for low-side buck and main boost MOSFETs; requires minimal-impedance routing |
| D2 | MODE | Forced PWM/AUTO selection - HIGH locks PWM mode; LOW enables automatic PFM/PWM transition |
| D3, D4 | SW2 | Switch node 2 - connects to second end of power inductor; complements SW1 in full-bridge operation |
| E2 | PG | Open-drain Power Good - pulled LOW during FAULT (OCP, OTP, UVLO) or soft-start failure; requires external pull-up |
| B2 | PT | Pass-through control - HIGH disables switching and routes PVIN to VOUT minus IR drop; disables OCP |
| E3, E4 | VOUT | Regulated output - delivers 3.3 V to load; includes internal discharge resistor (230 Ω) when EN = LOW |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck/boost/buck-boost transition | Eliminates output voltage glitch during PVIN crossing VOUT - critical for uninterrupted SoC operation in mobile devices |
| PFM/PWM hybrid control | Maintains >90% efficiency from 75 mA to 1 A load range without manual mode switching or external circuitry |
| Integrated safety protections | UVLO (2.00 V ±50 mV), OTP (150°C shutdown), SCP/OCP (peak current limit), and automatic FAULT recovery |
| Internal soft-start and output discharge | 260 µs soft-start prevents input surge; 230 Ω internal discharge resistor ensures rapid VOUT collapse on disable |
| Ultra-low quiescent current | 24 µA in PFM mode - enables multi-week standby in always-on NFC or sensor subsystems |
Applications
| Smartphone Core Rail | Tablet PMIC Secondary Output |
|---|---|
|
Use Scenario: Powers application processor I/O or memory interface in smartphones operating across full Li-ion voltage range (3.0–4.2 V). IC Role / Device Role / Timing Role: Primary buck-boost regulator maintaining stable 3.3 V rail regardless of battery state. Use Value: Eliminates need for separate buck and boost converters, reducing BOM count and PCB area by >30% versus dual-regulator solutions. |
Use Scenario: Supplies 3.3 V to display interface or audio codec in tablets where input voltage varies with USB/charger or battery source. IC Role / Device Role / Timing Role: Secondary regulated output in multi-rail PMIC architecture, handling dynamic load steps up to 2.5 A. Use Value: Delivers ±45 mV load transient response (0.5 A ↔ 1 A) and <4 mV ripple in PWM mode - meets display timing margin requirements. |
| NFC Transceiver Power | 4G/LTE PA Bias Supply |
|
Use Scenario: Powers near-field communication transceivers requiring clean, low-noise 3.3 V supply during RF burst transmission. IC Role / Device Role / Timing Role: Dedicated low-quiescent-current regulator enabling fast wake-from-sleep with sub-100 µs startup time. Use Value: 24 µA PFM IQ and 22 mV ripple at 100 mA (PFM) ensure minimal RF interference and extended battery life in always-listening mode. |
Use Scenario: Supplies bias voltage to 4G/LTE power amplifiers that demand high current (1–2 A) with tight voltage regulation during modulation peaks. IC Role / Device Role / Timing Role: High-current buck-boost stage delivering 3.3 V with ±125 mV worst-case transient deviation (0.5 A ↔ 2.0 A). Use Value: Full-bridge topology sustains regulation down to 2.5 V input - avoids PA brownout during deep battery discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63020DSJR | 2.5 V–6.0 V input, 3.3 V fixed output, 3 A max, 2.4 MHz switching, 20-pin QFN (3.0 × 3.0 mm) | Larger footprint and higher IQ (34 µA) - less suitable for space-constrained mobile designs | Preferred where board space allows and higher output current margin is needed beyond 2.5 A |
| MAX20004AATP+T | 2.5 V–5.5 V input, 3.3 V fixed output, 2 A max, 2.2 MHz, 20-pin TQFN (3.0 × 3.0 mm), AEC-Q100 Grade 1 | Automotive-qualified but lower current rating and no pass-through mode | Appropriate only for industrial or automotive systems requiring qualification - not drop-in for consumer mobile use |
Compared with TPS63020DSJR and MAX20004AATP+T, the FAN49100AUC330X offers the smallest footprint (11.61 mm² vs. ≥9 mm²), lowest PFM quiescent current (24 µA), and unique pass-through mode for zero-switching-loss battery backup - making it optimal for premium smartphone and ultra-thin tablet designs.
Availability
FAN49100AUC330X is available at Aetrix Electronics and suitable for smartphone core rails, tablet secondary power domains, and NFC transceiver supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing for high-volume production.
Supply support for FAN49100AUC330X includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
onsemi (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and portable electronics.
The FAN49100 belongs to onsemi's TinyPower™ family of ultra-compact, high-efficiency DC-DC regulators designed specifically for space- and power-constrained mobile and wearable applications.
FAQ
What is the output voltage tolerance of the FAN49100AUC330X under full load?
The FAN49100AUC330X delivers 3.3 V with ±1% DC accuracy (3.267–3.333 V) under forced PWM conditions at 0 mA load. Total output accuracy-including line/load regulation and transient effects-is ±5%, verified per Table 7. This ensures reliable operation for 3.3 V I/O interfaces in smartphones and tablets even under dynamic load steps up to 2.5 A.
Does the FAN49100AUC330X support automatic mode switching between buck and boost?
Yes, the FAN49100AUC330X automatically and seamlessly transitions between buck, boost, and buck-boost modes based on input voltage relative to the 3.3 V output. No external control is required - the internal modulator manages all transitions without output disturbance, as confirmed in the Functional Description section and Figure 29 of the datasheet.
What protection features are integrated into the FAN49100AUC330X?
The FAN49100AUC330X integrates under-voltage lockout (UVLO at 2.00 V ±50 mV), over-temperature protection (OTP shutdown at 150°C), over-current protection (OCP via peak current limiting), and short-circuit protection (SCP). All are internally implemented with automatic fault recovery after a 30 ms cooldown period - no external components needed.
Can the FAN49100AUC330X operate in pass-through mode, and what are its limitations?
Yes, asserting HIGH on the PT pin places the FAN49100AUC330X in pass-through mode, where VOUT tracks PVIN minus IR drop across internal MOSFETs. In this mode, only UVLO and OTP remain active - over-current protection (OCP) is disabled, and the device draws 27 µA quiescent current. It is intended for battery backup or low-noise bypass scenarios.
Is the FAN49100AUC330X still recommended for new designs?
No - the FAN49100AUC330X is marked DISCONTINUED per Table 1 on page 2 of the datasheet. onsemi states it is "not recommended for new design." However, Aetrix Electronics maintains active inventory and provides full supply-chain continuity support, including last-time-buy planning and cross-reference assistance for qualified replacements.
FAN49100AUC330X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- TinyPower™
- Package/Case:
- 20-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 2A
- Frequency - Switching:
- 1.8MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-WLCSP (1.96x1.56)
FAN49100AUC330X FAQ
1.How can I place an order for FAN49100AUC330X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN49100AUC330X on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for FAN49100AUC330X reliable?
The price and inventory of FAN49100AUC330X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN49100AUC330X is usually 5 days.
3.What payment methods are accepted for FAN49100AUC330X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN49100AUC330X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN49100AUC330X?
FAN49100AUC330X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN49100AUC330X order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for FAN49100AUC330X?
For technical support, including FAN49100AUC330X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN49100AUC330X requirements.
6.How does Aetrix verify that FAN49100AUC330X is sourced from the original manufacturer or authorized distributors?
All FAN49100AUC330X products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that FAN49100AUC330X meets industry standards.
7.What is the process for return or replacement of FAN49100AUC330X?
All FAN49100AUC330X units undergo pre-shipment inspection (PSI). If there is an issue with FAN49100AUC330X, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The FAN49100AUC330X part is unused and in its original packaging.
Return procedure for FAN49100AUC330X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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